Filament PHP v5 Coding Standards

Comprehensive standards for building production-grade Filament v5 admin panels. Filament v5 requires PHP 8.3+, Laravel 13+, Livewire 4+, Tailwind CSS 4.1+. Follow these rules exactly. For detailed code examples, see REFERENCE.md.

When to Apply

Apply to ALL Filament work: resources, forms, tables, infolists, actions, widgets, dashboards, panels, relation managers, imports/exports, custom pages, multi-tenancy, testing, and deployment.

1. Project Structure

Directory Layout

• Domain-grouped, plural-named: Resources/Shop/, Resources/Blog/, Resources/HR/
• Resources in plural directories: Resources/Shop/Products/ProductResource.php
• Schemas extracted: Resources/Shop/Products/Schemas/ProductSchema.php
• Tables extracted: Resources/Shop/Products/Tables/ProductsTable.php
• Multiple panels: Providers/Filament/AdminPanelProvider.php, AppPanelProvider.php